
import {
	Blob,
	btoa,
	createImageBitmap,
	CSSStyleDeclaration,
	performance,
	document,
	DOMParser,
	EventTarget,
	fetch,
	Headers,
	HTMLCanvasElement,
	Image,
	HTMLImageElement,
	ImageBitmap,
	location,
	navigator,
	Request,
	requestAnimationFrame,
	cancelAnimationFrame,
	Response,
	URL,
	window,
	self,
	WebAssembly,
	Worker,
	XMLHttpRequest,
	ImageData,
	TextDecoder,
	core
	} from 'dhtml-weixin';
import AnalyticLightNode from './AnalyticLightNode.js';
import { addLightNode } from './LightsNode.js';
import { uniform } from '../core/UniformNode.js';
import { mix } from '../math/MathNode.js';
import { normalView } from '../accessors/NormalNode.js';
import { objectPosition } from '../accessors/Object3DNode.js';
import { addNodeClass } from '../core/Node.js';

import { Color, HemisphereLight } from '../../../Three';

class HemisphereLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

		this.lightPositionNode = objectPosition( light );
		this.lightDirectionNode = this.lightPositionNode.normalize();

		this.groundColorNode = uniform( new Color() );

	}

	update( frame ) {

		const { light } = this;

		super.update( frame );

		this.lightPositionNode.object3d = light;

		this.groundColorNode.value.copy( light.groundColor ).multiplyScalar( light.intensity );

	}

	setup( builder ) {

		const { colorNode, groundColorNode, lightDirectionNode } = this;

		const dotNL = normalView.dot( lightDirectionNode );
		const hemiDiffuseWeight = dotNL.mul( 0.5 ).add( 0.5 );

		const irradiance = mix( groundColorNode, colorNode, hemiDiffuseWeight );

		builder.context.irradiance.addAssign( irradiance );

	}

}

export default HemisphereLightNode;

addNodeClass( 'HemisphereLightNode', HemisphereLightNode );

addLightNode( HemisphereLight, HemisphereLightNode );
